In a Dutch oven or big pot, add 3 tablespoons of oil. Heat the oil by turning the light on high.
Cook the onion and garlic for two minutes in the pot. Add the beef cubes after lowering the heat to medium-high. While constantly swirling, brown the meat.
Reduce the heat to medium until the meat has softly browned (and no red is visible).
The following ingredients should be added: tomatoes, beans, black pepper, salt, sliced jalapenos, and red pepper flakes. Mix well.
Add corn tortilla flour (or masa harina) after simmering for about 10 minutes to help the chili thicken.
Cook the chili for a further 10 minutes, or until it thickens.